单项选择题

Specialization is encouraged because ______.

A．people can use their money to buy whatever they want
B．people do not need to make a complete product for exchange
C．people make a great contribution to the manufacture of a product
D．people cannot use their money to buy whatever they want

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单项选择题

A．A film.B．The art festival.C．A play.D．The music Festival.

A．A film.
B．The art festival.
C．A play.
D．The music Festival.

单项选择题

If one had to save products instead of money, ______.

A．this would need years of practice
B．coal, for example, would lose its value
C．they could not be stored for years on end
D．many products would lose their value